Zinc(II) (o-hydroxybenzaldoximates) Complexes with Mono- and Bidentate Ligands

New complexes:Zn(Hsalox)(ox), Zn(Hsalox)(NHPh), Zn(Hsalox)(Hsal) and Zn(Hsalox)₂(1,2-diMeim) have been synthesised as a result of a reaction of Zn(salox) and Zn(Hsalox)₂ (where: salox ^2–=OC₆H₄CHNO^2–, Hsalox ^–=OC₆H₄CHNOH^–) with 8-hydroxyquinoline (Hox), o-aminophenol (NH₂Ph), o-hydroxybenzoic acid (H₂Sal) and 1,2-dimethylimidazole (1,2-diMeim). Chemical, X-ray and thermal analyses of the complexes and their sinters have been carried out. Thermal decomposition pathways have been postulated for the complexes. The mixtures about not definite composition have been obtained as a result of a reaction of zinc(o-hydroxybenzaldoximates) with imidazole(Him) and 4-methylimidazole (4-MeHim). This revised version was published online in August 2006 with corrections to the Cover Date.     

Zinc(II) di(o-hydroxybenzoate) complexes with imidazole and its derivativesSynthesis,thermal characterization and molecular structures

Mixed complexes of the type: Zn(Hsal)₂(Him)₂, Zn(Hsal)₂(Him)₅, Zn(Hsal)₂(4-MeHim)₂ and Zn(Hsal)₂(1,2-diMeim)₂ (where Hsal=OHC₆H₄COO^-, Him=imidazole, 4-MeHim=4-methylimidazole, 1,2-diMeim=1,2-dimethylimidazole) have been synthesized. The application of chemical, thermal and X-ray methods has enabled us to analyze the complexes and their sinters. The gaseous products of pyrolysis of Zn(Hsal)₂(Him)₂ and Zn(Hsal)₂(4-MeHim)₂ have been investigated. Thermal decomposition pathways have been postulated for synthesized complexes. The molecular structures of the Zn(Hsal)₂(Him)₂ and Zn(Hsal)₂(1,2-diMeim)₂ have been solved.     

Thermal Investigation of the Compounds of the Copper(II) Mono(o-hydroxybenzoate) with Chelate Ligands

Heteroligand complexes of copper(II) were obtained as a result of the reaction of Cu(II) mono (o-hydroxybenzoate) (monohydrate) with 8-hydroxyquinoline (HOx), o-aminophenol (NH₂Ph) and 2,2′-dipyridyl (2,2′-dipy). The mixture of the mono compound with: Cu(II) di(o-aminobenzoate) or Cu(II) di(o-hydroxybenzaldoximate) were obtained by the reaction with o-aminobenzoic acid (H₂A) and o-hydroxybenzaldoxime (H₂Salox). The obtained compounds and their sinters were subjected to chemical, X-ray and thermal analyses. This revised version was published online in July 2006 with corrections to the Cover Date.     

Preparation and Thermal Decomposition of Copper(II) Complexes with 4-Methylimidazole

Simple and mixed compounds of the formulae Cu(4-Meim)₂, CuSal(4-Meim), CuSal(4-Meim)₂ and CuSalox(4-Meim)₂, where 4-Meim=4-methylimidazole, Sal=(OC₆H₄COO)²⁻, Salox=(OC₆H₄CHNO)²⁻ have been prepared. Thermal decomposition reactions have been established on the basis of thermal and X-ray analyses of these compounds. The pyrolysis proceeds in several (3–4) stages connected with the mass loss and exothermic effects. As a result of the last stage of decomposition CuO is formed. This revised version was published online in August 2006 with corrections to the Cover Date.     

Investigation of thermal decomposition of anthranilates of alkaline earth metals

The thermal properties of calcium, strontium and barium anthranilates (general formula MA₂·n H₂O, whsre M='metal, and) were studied. Thermal, chemical and X-ray analysis, as well as infrared spectra, were used to determine the mechanism of decomposition for these compounds. Calcium anthranilate is decomposed in four stages; the final reaction product is calcium oxide. The other anthranilates are decomposed in three stages; the final reaction products are strontium carbonate and barium carbonate.

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Zusammenfassung Die thermischen Eigenschaften von Kalzium-, Strontium- und Bariumanthranilat (mit der allgemeinen Zusammensetzung MA₂·n H₂O, M=Metall, wurden untersucht.Die Zersetzungsmechanismen dieser Verbindungen wurden durch thermische, chemische- und Röntgenanalyse und mit Infrarotspektroskopie ermittelt. Kalziumanthranilat zersetzt sich in vier Stufen. Das Endprodukt ist Kalziumoxyd. Die anderen Anthranilate zersetzen sich in drei Stufen und geben Strontiumkarbonat und Bariumkarbonat als Endprodukt.

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, MA₂·nH₂O, =, , , . . . .

     

Thermal decomposition of silver(I) and mercury(I) anthranilates and salicyloaldoximates

The processes of thermal decomposition of silver(I) and mercury(I) anthranilates and salicyloaldoximates were studied. Thermal, chemical and X-ray analyses and infrared spectroscopy were used to determine the mechanisms of decomposition of these complexes. The factor determining the decomposition is the character of the Ag⁺ and Hg ₂ ²⁺ ions, which are easily reduced to free metals. The final reaction product of the compounds of silver is the pure metal; the compounds of mercury are volatilized completely when heated.     

Zinc(II) and cadmium(II) complexes with <Emphasis Type="Italic">o</Emphasis>-hydroxybenzoic acid or <Emphasis Type="Italic">o</Emphasis>-aminobenzoic acid and 2-methylimidazole

Mixed complexes of the type: Zn(Hsal)₂(2-MeHim)₂, Zn(Han)₂(2-MeHim)₂, Cd(Hsal)₂(2-MeHim)₂, Cd(Han)₂(2-MeHim)₂, where Hsal=OHC₆H₄COO⁻, Han=NH₂C₆H₄COO⁻, 2-MeHim=2-methylimidazol) have been synthesized and characterized by IR spectroscopic and X-ray diffraction studies. Single-crystal X-ray structure of Cd(Hsal)₂(2-MeHim)₂ has been obtained. Thermal behaviour of the compounds was investigated by thermal analysis (TG, DTG, DTA). A coupled TG-MS system was used to analyse the principal volatile products of complexes. Thermal decomposition pathways have been postulated.     

Investigation of thermal decomposition of anthranilates of alkali metals

The thermal properties of the anthranilates of the alkali metals Li, Na, K, Rb and Cs were studied. Thermal, chemical and X-ray analyses and infrared spectroscopy were used to determine the reactions of decomposition of these compounds. The thermal properties of the anthranilates of the alkali metals were compared with those of other metals.This work was done within Project 01.17: New Methods in Analytical Chemistry and Their Application in the National Economy.